function s1_hello(){
echo"hello,world!"
}

function s2_tell_who_i_am(){
echo"$(whoami)"
}

function which_distro_do_i_use(){
command -v lsb_release >/dev/null;
echo "$(lsb_relsease -si)"
}

function view_my_cpu_arch(){
uname -m
}

function show_first_scsi_disk_size(){
lsblk -1 | \grep disk | \grep'^sda' |awk'{print $4}'
}

function show_main_memory_size_in_megabytes(){
free -m |grep "Men:" |awk'{print $2}'
}
